Abstracted out command arguments a bit

NadekoBot.Core/Common/INadekoCommandOptions.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NadekoBot.Core.Common
+{
+    public interface INadekoCommandOptions
+    {
+        void NormalizeOptions();
+    }
+}

NadekoBot.Core/Common/OptionsParser.cs

@@ -0,0 +1,20 @@
+using CommandLine;
+
+namespace NadekoBot.Core.Common
+{
+    public class OptionsParser
+    {
+        private static OptionsParser _instance = new OptionsParser();
+        public static OptionsParser Default => _instance;
+
+        static OptionsParser() { }
+
+        public T ParseFrom<T>(T options, string[] args) where T : INadekoCommandOptions
+        {
+            var res = Parser.Default.ParseArguments<T>(args);
+            options = (T)res.MapResult(x => x, x => options);
+            options.NormalizeOptions();
+            return options;
+        }
+    }
+}